NFL.com and NFL Network's Michael Lombardi and Ian Rapoport reported Sunday that the Bills will acquire Tarvaris Jackson in a trade from the Seattle Seahawks, according to sources with knowledge of the situation.

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Seattle was expected to part ways with Jackson. After the Seahawks sunk money into free-agent Matt Flynn, only to watch rookie Russell Wilson emerge as the team's most exciting passer (he was named the team's starter on Sunday), Jackson became the odd man out.

The impending trade likely marks the end of Vince Young's brief stint with the Bills, where coach Chan Gailey has obviously seen enough from the former Tennesse Titans and Philadelphia Eagles passer who sputtered in three preseason appearances for Buffalo. Gailey has thrived working with mobile quarterbacks, but Young struggled to adapt to Buffalo's spread offense.

Jackson is yet another mid-level passer, but an upgrade over Young. None of this is good news for backup Tyler Thigpen. The Bills have said all summer they're committed to keeping versatile Brad Smith as the team's third passer.

From top to bottom, Buffalo continues to re-evaluate the quarterback position. Ryan Fitzpatrick is today's starter, but the reshuffling below him -- Gailey's tireless quest to upgrade -- suggests that questions remain.

Update:Seahawks coach Pete Carroll confirmed the deal had been agreed to by both teams Sunday, but added the trade wasn't completed.

"It has been agreed upon, but there is still a little bit of paperwork to do," Carroll said during a telephone conference call with reporters, according to The Associated Press. "It might be done tonight. It is scheduled to be done."